Business Segment and Significant Customer Information - Additional Information (Detail)	3 Months Ended
Mar. 31, 2022 Customer Segment	Mar. 31, 2021 Customer
Entity Wide Revenue Major Customer [Line Items]
Number of reportable segments \| Segment	2
Customer Concentration Risk \| Sales \| Drilling Services
Entity Wide Revenue Major Customer [Line Items]
Number of customers accounted for revenues	3	3
Customer Concentration Risk \| Sales \| Managed Services
Entity Wide Revenue Major Customer [Line Items]
Number of customers accounted for revenues	1
Percentage of revenue (excluding reimbursable revenue)	14.00%
Customer Concentration Risk \| Sales \| Customer One \| Drilling Services
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue (excluding reimbursable revenue)	29.00%	44.00%
Customer Concentration Risk \| Sales \| Customer Two \| Drilling Services
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue (excluding reimbursable revenue)	23.00%	36.00%
Customer Concentration Risk \| Sales \| Customer Three \| Drilling Services
Entity Wide Revenue Major Customer [Line Items]
Percentage of revenue (excluding reimbursable revenue)	13.00%	20.00%

Number of individual customers accounted for more than ten percent of revenue.

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e9054-108599

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6351-108592

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13531-108611

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e6404-108592

+ Details

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Balance Type:	na
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI http://asc.fasb.org/extlink&oid=123359005&loc=d3e8672-108599

+ Details

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- Details

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- Details

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